Steam-superheater.



No. 764,625. PATENTED JULY 1904. E. -PIELOGK.

STEAM SUPERHEATER. APPLICATION FILED SEPT. 13. 1902.

H0 MODEL.

UNITED STATES Patented July 12, 1904.

PATENT OEEIcE.

STEAM-SUPERHEATER.

SPECIFICATION forming part of Letters Patent No. 764,625, dated July 12,1904. Application filed September 13, 1902. Serial No. 123,229. (Nomodel.)

To all whom it may concern.-

Be it known that I, EDUARD PIELocK, engineer, a subject of the King ofPrussia, German Emperor, residing in Berlin, Prussia, Germany, haveinvented certain new and useful Improvements in Steam-Superheaters, ofwhich the following is a specification.

My invention relates to improvements in super-heaters located in thewater-space of the steam-boiler. For the purpose of saving or preservingthe heating-walls to a maximum extent it is necessary that the dampsteam, which has the lowest temperature, come in contact with that partof the heating-surface which is at thehighest temperature, andconsequently the hottest steam in contact with the relatively coldestheating-surfaces. The steam of higher temperature, however, must beconducted over the heating-surfaces with a greater velocity. The watersurrounding the tubes, however, tends to cool by conduction that portionlocated in the superheater and this cooling medium. Thus that part ofthe tubes lying near the middle of the superheater will have a highertemperature than the portion at the tube-plates. The large surfaces ofthe shell of the box, which only assume the temperature of theboiler-water, are not adapted to promote superheating of the steam. Onthe contrary, they will unfavorably influence the purpose in view.

My new superheater is illustrated in the accompanying drawings, in whichFigure 1 is a longitudinal section, and Fig. 2 a cross-section, of theapparatus applied to the boiler.

In my improved superheater the heatingwalls are saved or preserved by acombined parallel current and counter-current superheater.

The superheater consists of a box M, which is arranged inside the boilerof any known type in such manner that the boiler-pipes pass through thesame. Openings (Z or short tubes are provided at the top of the box Mfor allowing the steam from the upper part of the boiler to enter thesuperheater. Inside of the box there are a number of partition-wallsarranged in such manner that the partitionwalls next to the openings (Zcontact with the top of the superheater and reach down so far asto leavea space of suflicient height to allow the steam to pass below thepartition-walls. The next partition-walls contact with the bottom of thesuperheater and leave a space on top again to allow the steam to pass.Thus the walls are arranged in staggered position, so as to divide thesteam into two streams followingza Zigzag path. The partition-wallscdivide the box into a number of chambers, of which the center one hasthe greatest sectional area, while the succeeding chambers decrease inwidth. The end chambers are connected by two or more pipes g with theboiler-dome.

The efiiciency of the apparatus is increased by isolating shells orplates it, the temperature of which is raised by the warmer tubeslocated in immediate proximity.

The steam enters the superheater at d, is conducted down and up again bythe partitionwalls toward either side, increases continually in velocityowing to the decreasing section of the passages, and leaves thesuperheater heated by the two pipes g, whence it isconducted away foruse. One part of the steam is superheated in the parallel current, theother in the countercurrent.

Having now particularly described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A compound parallel and counter current superheater comprising a boxa surrounding the fire-tubes of the boiler, divided by partitions 0whereby a relatively large heatingsurface is presented to the steamentering, and a smaller heating-surface to the steam leaving theapparatus, the steam being conducted in such manner that one part issuperheated in the parallel current and the other part in thecotmter-current, substantially as described.

2. A compound parallel and counter current superheater comprising a boxa surrounding the fire-tubes ot' the boiler, divided by partitionswhereby a relatively large heating surface is presented to the steamentering, and a smaller heating-surface to the steam leaving theapparatus, and having isolating shells or plates 2' for preventing thesteam circulating in the apparatus from being cooled by contact with theshells of the box a, the steam being conducted in such manner that onepart is superheated in the parallel current and the other in thecounter-current, substantially as described.

3. In a super-heater, the combination of a box which surrounds the tubesand is itself surrounded by the water-space of a steamboiler withpartitions which are unevenly distributed in the box so as to presentpassageways of graduallydecreasing cross-section, an inlet for the boxwhere the cross-section is relatively large and exits from the box wherethe cross-sections are relatively small.

4. In a superheater, the combination of a steam-generator having tubesand a waterspace with a box which incloses a portion of said tubes, anopening into the box from the steam-space within the steam-generator, adis- EDUARD PIELOCK.

Witnesses: 7

VVOLDEMAR HAUPT, VILLIAM MAYNER.

